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From Jack Levin <magn...@gmail.com>
Subject Re: stopping namenode and regionservers
Date Wed, 06 Oct 2010 07:04:58 GMT
I am running 0.89 with append, so I won't be losing it anyway, its
just a pain to start with unflushed logs.

-Jack

On Tue, Oct 5, 2010 at 11:38 PM, Jonathan Gray <jgray@facebook.com> wrote:
> If you can live with restarting your NN, you are living with downtime.  I'd definitely
recommend running your NN on a mirrored RAID so it doesn't get taken out by a single bad disk.
>
> As you say, stop HBase first if you are the one restarting the NN (not a hardware failure).
 Then you won't lose data.
>
>> -----Original Message-----
>> From: Jack Levin [mailto:magnito@gmail.com]
>> Sent: Tuesday, October 05, 2010 11:31 PM
>> To: user@hbase.apache.org
>> Subject: Re: stopping namenode and regionservers
>>
>> Many reasons... like broken disk, ram, any sort of hardware
>> malfunction, just plain failure of namenode for any reason.
>> Generally, I guess I should be stopping regionservers before namenode
>> restart, at least I won't generate unflushed data.
>>
>> -Jack
>>
>> On Tue, Oct 5, 2010 at 11:25 PM, Jonathan Gray <jgray@facebook.com>
>> wrote:
>> > Currently HBase cannot ride over an HDFS restart.
>> >
>> > Might be feasible in the future but not currently planned.  Some of
>> the NameNode HA solutions might indirectly address this.
>> >
>> > Why is it that you need to restart your namenode?
>> >
>> >> -----Original Message-----
>> >> From: Jack Levin [mailto:magnito@gmail.com]
>> >> Sent: Tuesday, October 05, 2010 10:45 PM
>> >> To: user@hbase.apache.org
>> >> Subject: stopping namenode and regionservers
>> >>
>> >> Hi, is it possible to tell regionservers not to die/stop when
>> namenode
>> >> is restarted?  Every onces in a while I need to restart namenode,
>> and
>> >> it causes all regionservers pretty much to shutdown, and in many
>> cases
>> >> not cleanly, which causes long start up delays (hlog, etc).
>> >>
>> >> Thanks.
>> >>
>> >> -Jack
>> >
>

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